Portable door alarm



FIG. 1 is a front perspective view from above and one side of a portable door alarm showing my new design;

FIG. 2 is a view of the opposite side thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a bottom view thereof; and

FIG. 5 is a front perspective view thereof with the supporting hook in an extended position. 

The ornamental design for a portable door alarm, as shown. 